Satellite-derived phytoplankton biomass and production variability in 2 contrasting coastal areas: off southern California and off northern Baja California
In order to compare phytoplankton biomass (satellite-derived c hlorophyll, Chl sat ) and production (PP), and sea surface tempera- ture (SST) between the regions north and south of the Ensenada Front, time series were generated from satellite imagery for 25 0-km transects perpendicular to the coast:...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | México |
| Institución: | Centro de Investigación Científica y de Educación Superior de Ensenada |
| Repositorio: | Redalyc-CICESE |
| OAI Identifier: | oai:redalyc.org:48054149003 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=48054149003 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra Ensenada Front Sea sur face temperature Seasonal and interannual variations Phytoplankton biomass and production |
| Sumario: | In order to compare phytoplankton biomass (satellite-derived c hlorophyll, Chl sat ) and production (PP), and sea surface tempera- ture (SST) between the regions north and south of the Ensenada Front, time series were generated from satellite imagery for 25 0-km transects perpendicular to the coast: one off La Jolla (TLJ), southern Ca lifornia (USA), and the other off San Quintín Bay (TSQB), Baja California (Mexico). Moderate Resolution Imaging Spectroradiometer (MODIS) SST and Chl sat monthly composites and PP monthly composites were used for the 2002–2016 period. An “average year” was generated for each transect and each variable as an approximation to the climatology. Data show spatial variation in Chl sat and PP with higher values in the coastal zone (>10.0 mg·m –3 and >4.0 g C·m –2 ·d –1 , respectively) than offshore (~0.1 mg·m –3 and 0.4 g C·m –2 ·d –1 , respectively), while SST showed, in general, minimum values i n the coastal zone (~15.0 ºC) and maxima offshore (~21.0 ºC). In the coastal zone, Chl sat values were higher on TSQB than on TLJ. However, sometimes phy toplankton biomass was higher in the offshore waters of TLJ than in the offshore w aters of TSQB because of the effect of high Chl sat plumes coming from Point Conception into the Southern California Bight. The SST, Chl sat , and PP variations had clear seasonal and interannual componen ts. Spectral analysis shows that the seasonal component of variation was dom inant for the 3 variables. The 2004 central Pacific type of El Niño, the 2014 “Blob”, and the 2015–2016 eastern Pacific type of El Niño had v ery strong effects on phytoplankton biomass and production alon g both transects. Nevertheless, the effects generally tended to be str onger at TLJ than at TSQB. There are spatial variations in the coastal dynamics of the California Current System, and thus the effects of seasonal and interannual events will not be the same at different geogr aphic locations. |
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